61880 bearing: complete specifications & equivalents
The 61880 is a ISO 15 radial bearing sized 400 x 500 x 46 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 400 mm |
| Outer diameter D | 500 mm |
| Width B | 46 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 251 kN |
| Basic static load rating C0 | 340 kN |
| Fatigue load limit Pu | 10.6 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Mass | 20600 g |
| Manufacturer designation | NTN 6880 |
| Standard | ISO 15 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203-3/E (2024) |
| Last verified | 2026-09-25 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)) · extracted 2026-09-25
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 61800-series range
| Bore d | 15.748 in |
|---|---|
| Outer diameter D | 19.685 in |
| Width B | 1.811 in |
| ISO bore code | 80 |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in 61800-series | 10 mm |
| Largest outer diameter in 61800-series | 600 mm |
| Width range across 61800-series | 5–56 mm |
| Bore position in 61800-series (smallest first) | 42 of 46 |
| Bore above smallest 61800-series size | 390 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61880 | ISO-INTERCHANGE | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 61880 model number is decoded
In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61880 carries bore code 80 = 400 mm. Outside diameter 500 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).
Typical equipment & failure modes
Common applications
- textile machinery
- packaging machinery
- space-constrained gearboxes
- clutch and transmission assemblies
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- cage damage from operation beyond the limiting speed
- electrical pitting in VFD-driven motors without grounding protection
Selection pitfalls — read before you substitute
- Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.
- The 618xx thin section at 400 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6280.
- The open 61880 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×500×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61880 units.
- Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.
- The open 61880 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.
- The 251/340 kN load ratings, 10.6 kN fatigue load limit Cu and 20600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6880; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive.
Frequently asked questions
What are the dimensions of a 61880 bearing?
A 61880 deep-groove ball bearing has a 400 mm bore, 500 mm outer diameter and 46 mm width (15.748 × 19.685 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
How does the 61880 bore code work?
The last two digits of 61880 are bore code 80, giving 80 × 5 = 400 mm bore. The 500 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 61880 mean?
A bare 61880 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication.
How does the 61800 compare with other series at the same 400 mm bore?
618 is an extra-thin section: 500×46 mm, only 50.0 mm radial section at 400 mm bore, far smaller than a 6280, for space-limited layouts at the cost of load rating and misalignment tolerance.
What is the NTN designation and catalogue data for 61880?
In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6880 — the open (unsealed) execution, 400×500×46 mm per ISO 15. Quoted values: C 251 kN, C0 340 kN, Cu 10.6 kN, mass 20600 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61880 follows the seal-suffix convention used across this site, not NTN order-number spelling.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203-3/E (2024) on 2026-09-25. Read our editorial & correction policy.